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. 1971 Sep;68(9):2006-7.
doi: 10.1073/pnas.68.9.2006.

Autoinhibition of acetylcholine binding to Torpedo electroplax; a possible molecular mechanism for desensitization

M E Eldefrawi, R D O'Brien

Autoinhibition of acetylcholine binding to Torpedo electroplax; a possible molecular mechanism for desensitization

M E Eldefrawi et al. Proc Natl Acad Sci U S A. 1971 Sep.

Abstract

Binding of [(3)H]acetylcholine (measured by equilibrium dialysis) to a particulate preparation of Torpedo electroplax exhibits autoinhibition at concentrations higher than 1 muM. It is suggested that autoinhibition results from acetylcholine binding to regulatory sites on its receptor macromolecules. This binding causes the change to a new and inactive conformation and rejection of acetylcholine bound to the larger number of active sites. The relationship to the physiological phenomenon of desensitization is discussed.

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